Disintegrator screen



May 20, 1947 c. w. LANrER I 2,420,670

DISINTEGRATOR SCREEN' Filed Feb. 23, 194:4 s sheets-sheet 1 C. W. LANTERDISINTEGRATOR SCREEN -May 20, 1947.

Filed Feb. 23, 1944 3 Sheets-Shee; 2

May 20, 1947. C, W LANTER 2,420,670

DISINTEGRATOR SCREEN Filed Feb. 23,' 1944 5 Sham-sheet s Patented May20, 1947 DISINTEGRATOR SCREEN Clarence -WL Lanter, Du Page County,.I1l.,assignor toBirtrnan Electric Company, ,ai corporation of Illinois.

Application February 23, 1944, Serial No. `523,513

(c1. zii- 865' 8 Claims'.

This invention relates to a disintegrator screen and to a disintegratorin which it is useful.

The ordinary disintegratorA screen is a. foraminous sheet of metal inwhich the perforations are separated. In the presentinvention thedisintegrator screen comprises a web of material formed in the usualarced shape and provided with transverse slots instead ofperforations.

The device willlie-described*particularly in con-Y nection withv adisintegrator suchl as is shownin my co-pending applicationslSerial Nos.502,754 and 502,755, ledAugust 17, 1943;

The invention is illustrated in the drawings in which Figure 1 is afront elevation partly insection of a disintegrator; Figure 2 is a sidesectional elevation of a disintegrator; Figure 3 is a side View of thescreen; Figure 4 is a section taken along the line 4--4 in Figure 3;Figure 5 is a section taken along the line 5-5 in Figure 3; Figure 6 isa section taken along the line 6-6 in Figure 5; and Figure '7 is a sideView of a modied form of screen.

The rotor comprises a housing I0 consisting of a top housing II, and abottom I2. Disintegration is accomplished by the hammer I4 rotated onthe shaft I3 by a motor I5 at an extremely high rate of speed. The rotoris within a disintegrator chamber I6 and a screen II is mounted in thechamber about the path of the rotor or hammer.

The screen, as shown in Figure 7, preferably extends completely aroundthe path of the hammer. In the form shown in Figure '7 the screen IIcconsists of a web of metal bent to circular form and provided with aseries of equally spaced transverse slots |80 extending entirely acrossthe disintegrator chamber and substantially across the web I9 of metal.An unslotted edge portion 2l] is left at each edge of the screen andthis portion projects into the groove 2| on the inner face of thegrinding chamber and is supported by a circular shoulder 22 on the outerface. While this is illustrated as a groove, it may also be a shoulderagainst which the screen rests or against which it is held by itsnatural resilience.

It is preferred that the groove 2| have a width greater than thethickness of the screen so that the position of the screen with relationto the hammer may be adjusted. In Figure 2 the screen is shown asprovided with an upstanding ange 23 which fits firmly against the inneredge of the groove.

The disintegrator includes a hopper having a hopper opening 3l in thetop of the disintegrator, and material feeds from the hopper to the gate2, 32 inside the rotor. Material is ground primarily in thedisintegrating zone between the hammer faces 33-and'the screen I'I.

It has been found that the size of the openings may be determined-muchmore accurately by the use of slots rather than the ordinary'roundopenings,v since there is less wear upon the stamping instrument.Furthermore the average distance between openings may be greatlyreduced, particularly by reduction of the maximum distance which aparticle may travel without striking an opening. It is well known thatthe openings in the screen serve as grinding surfacesy and that theactual particles passing through the openings are very much smaller indiameter than the openings themselves. Therefore, the particles arestruck either by the hammer faces or by the edges of the openings manytimes before being finally demolished into the proper size granules orparticles. When slots are used, the effective cutting edge area isgreatly increased in ratio to the total area of the openings, eventhough the total perimeter of the openings may be reduced. This isbecause the edges of the openings tend to shield themselves and to causeparticles to glance off without getting far enough into the opening toproduce a firm impact upon a sharp edge.

In the form of screen shown in Figure 3, the screen extends entirelyaround the hammer path but a portion thereof is provided with anonperforated band 4I provided with `Crusher bars 42. These bars arewelded to the surface of the screen.

In the form of screen shown in Figure 7, the screen I'lc is providedwith slots I8c extending the entire circumference of the hammer path.

Figure 6 illustrates a form of screen in which the web opposite thestriking face of the slot is slightly depressed. This may beaccomplished in stamping, the upper surface of the web being inclinedtoward the slot. In this way a greater effective striking edge may besecured.

The foregoing detailed description has been given for clearance ofunderstanding only, and no unnecessary limitations should be understoodtherefrom.

What I claim as new, and desire to secure by Letters Patent, is:

1. In a disintegrator, a shaft adapted to be rotated. a hammer mountedon the shaft, a housing defining a disintegrating chamber about the pathof the hammer, said housing including a side wall adjacent the hammer, asubstantially circular groove in the wall slightly outside the path ofthe hammer and having a substantial width, a light-Weight resilientdisintegrator screen of sheet metal in ring form and having a thicknessless than the Width of the groove, and a iiange upon one edge only ofthe screen of a height sufhcient to secure the screen in said groove,said screen being normally of slightly greater diameter than themounting groove and held in said spaced relationship at least partiallyby the resiliency of the ring.

2. A disintegrator as set forth in claim 1, in

which the screen extends entirely about the pathA of the hammer.

3. A disintegrator as set forth in claim 1, in which the screen isprovided with a series of transverse equally spaced slots.

4. A disintegrator as set forth in claim 1 Wherein said screen comprisesa web having parallel transverse slots therein substantially at rightangles to the direction of the movement of the disintegrator hammer.

5. A disintegrator as set forth in claim 1 Wherein said screen comprisesa ring of metal provided throughout the major portion of itscircumference with screening perforations.

6. A disintegrator as set forth in claim 1 Wherein said screen comprisesa web having parallel transverse slots distributed at substantiallyequal intervals about the entire circumference of the screen.

7. A disintegrator as set forth in claim 1 wherein said flange issubstantially at right angles to said screen.

8. In a disintegrator, a shaft adapted to be ro- Viiange upon one edgeonly of the screen of a height sufcient to secure the screen in saidgroove, the opposite edge of the screen being held in operativerelationship by Contact with said removable side Wall, said screen beingnormally of slightly greater diameter than the mounting groove and heldin said spaced relationship at least partially by the resiliency of thering.

CLARENCE W. LANTER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 705,796 Sutoliffe July 29, 19021,634,026 Fritz June 28, 1927 658,288 Shaw et al Sept. 18, 19002,215,226 Meyer Sept. 17, 1940 739,227 Schutz Sept. 15, 1903 2,352,127Sheldon June 20, 1944 1,704,757 Mead Jr Mar. 12, 1929

